Author： Keay J. Turton A. G. Campbell N. A.
Publisher： Society of American Foresters
ISSN： 0015-749X
Source： Forest Science, Vol.14, Iss.4, 1968-12, pp. : 408-417
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Abstract
Fertilization of Pinus pinaster on a lateritic gravelly soil with urea and superphosphate increased the size of current needles and their nitrogen and phosphorus concentrations within 6 months of application. Girth increments after 18 months were increased up to threefold. The photosynthetic ability of needles up to 5 years old was increased, although the effect was greatest in 1- and 2-year-old needles. This effect was associated with higher concentrations of nitrogen, phosphorus, chlorophylls 'a' and 'b', and moisture in the needles. Stem growth during the dry summer was maintained at a constant rate, whereas in untreated trees stem growth ceased for the 2 hottest months.
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